
Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Black swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)

Whooper swans are pictured at a wetland in Sanmenxia, central China's Henan Province, Nov. 14, 2024. A large number of migratory swans flied to the Yellow River wetland in Sanmenxia to spend winter. (Photo: Xinhua)